Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Material level or thickness responsive
Patent
1995-11-05
1998-05-19
Drodge, Joseph W.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Material level or thickness responsive
210141, 210406, 210511, 422 681, 422101, 422103, B01D 1712, B01D 1100
Patent
active
057531056
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Increasing interest, including concern for the environment has lead to more and more quality control of air and water.
Analytical methods used by laboratories to analyze aqueous samples for organic components, require laboratory personnel to follow very specific and time consuming operations. As more samples need to be analyzed, laboratories are looking for new ways to handle the increased sample load, and at the same time, to provide accurate and reproducible data.
To aid in this endeavor, recent methodology improvements by the US EPA have introduced a filtration procedure, whereby organics are chemically removed from the water sample. The water sample is passed through a filter media which contains a chemical adsorbent. Once the water sample has passed through the filter, the filter is extracted with an organic solvent. This solvent is collected and later analyzed.
A number of problems are associated with this filtration procedure. First, in order to ensure the filter media is properly conditioned, the filter must be washed and soaked with organic solvents, in a proper sequence, in order to change the polarity of the filter media. As the filter media is being conditioned, it is critical that the surface of the filter media not be exposed to air. Once the water sample has been filtered, the filter media must be carefully soaked and eluted to ensure adequate recovery of the organics of interest. These time critical, and time consuming steps, make consistent and reproducible recoveries difficult to achieve.
There exists a great need for precise automated devices and methods for sample analysis.
SUMMARY OF THE INVENTION
I have discovered an improved automatic filtration and extraction device which comprises a base means defining at a top end thereof a substantially broadened cavity area, tapering downwardly and inwardly from said top end thereof to further define a chamber means for a portion thereof and then further defining a plurality of effluent outlet means at a bottom end thereof, each extending from said chamber means to an outer surface of said body means. A plurality of sealing means are adapted to each of said outlet means. Each is moveable between a first closed position sealing said outlet means and a second open position allowing the passage of effluent. A filter means detachably and removeably adapts over said substantially broadened cavity area. Solvent providing means are adapted to said housing means whereby various solvents are provided to said substantially broadened cavity area. Programmable memory means are connected to the housing means and provide a series of events. Circuit means are connected to a power source and to the programmable memory means to access and direct a sequence of events after an initial event. Vacuum means are adapted to each of said effluent outlet means, each vacuum means having an "ON" position whereby vacuum is provided to induce effluent flow through said effluent outlet means and to seal off the other effluent outlet means, preventing "backflow", and an "OFF" position eliminating vacuum.
My method for improved automatic filtration and extraction comprises the steps of placing a filter, specifically designed for a specific adsorbate, in the extraction device. The filter is then washed with a cleansing solvent. The sample is then filtered with the desired chemicals adsorbed in the filter. The test simple is then extracted from the filter by a preferred solvent and deposited in a sample tube.
Preferably but optionally my improved automatic filtration and extraction device includes a directed flow solvent dispensing ring so that the introduction of solvent may be made in as uniform a manner as possible to thoroughly wash down the internal walls of my device.
Preferably but optionally the filter means in my improved extraction device includes a filter of the type in which a desired adsorbate is specifically adsorbed and then extracted. More particularly, these filters such as 3M's EMPORE.RTM. filter can be made for specific adsorptio
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